Bobbin



J. L. DETERS Dec. 20, 1938.

BOBBIN Filed June 7, 1957 35 mstance to fracture.

Patented Dem-.20, 1938 UNITED As'rii'rlazs PATENT OFFICE 2,140,497 Bonnin l tion of Ohio Application June 7, 1937, Serial No. 146,937

1 Claim.

This invention relates to bobbinsand more particularly to a bobbln having end anges made of laminations of material impregnated with a var-l nish, such as Bakelite, the mass being com- 5 pacted and hardened under heat and pressure.

Large size bobblns, whose flange diameter may be in some cases 33 inches and whose barrel portion is sometimes 16 inches, have heretofore been made of wood such as hard maple. At the pres- "0 ent day it is difficult to iind suitable hard maple for making such bobbins and there is a marked demand, also in the smaller sizes, -for material which will not surface raise because of moisture absorption and which is not affected by chemicals 5 which are found in certain yarns. In cottonyarn a chlorine wash is sometimes used and in rayon, sulfuric acid', sodium sulfate, and magnesium sulfate may be present in suiilcient quantities to in- .iure a-wooden bobbin.

20 An object of the invention is to provide a bobbin whose end flanges are formed integrally with the barrel portion so that there'will be no crack or seam at the ends of the bobbin to catch mate-` rial wound thereon. In bobbins heretofore used l5 this was a source of great difdculty as the end flanges had a tendency to warp away from the barrel portion but this dimculty is completely overcome by the present invention. .Y

Another object of the invention is to provide a flange whoselaminations are disposed at right angles to the axis of the bobbln and is provided with outside laminations of woven fabric impregnated with a binder which hardens under heat and pressure giving high tensile strength and re- The inner laminations may be of paper impregnated with the same binder which hardens under heat and pressure and gives maximum smoothness and resistancey to wear.

. 4 ,A further object of the invention is to form a 40 bobbln in two parts which may be manufactured Without difliculty and can be joined with overlapping flanges in a manner that will leave no open cracks in the barrel portion to catch yarns, or the like.

The invention is illustrated in a preferred embodiment in the accompanying drawing, in which:

Figure 1 is an elevational view of a bobbin embodying the invention; Fig. 2 is a bottom end view of the same; Fig. 3 is a sectional view, taken as indicated at line 3-3 of Fig. 2; and Fig. 4 is a fragmentary sectional view on an enlarged scale, taken as indicated at line I of Fig. 2.

In the embodiment illustrated the bobbln is made up of a lower half 5 and an upper half i.

'I'he lower half 5 is provided with an` integrally formed end flange 'I and the upper half is pr vided with a similarly formed end flange 8. The end flanges may be provided with suitable finger holes 9 to facilitate handling, and openings I0 to 5 receive parts of the spindle of a machine.

As best shown in Fig. 4, the end flanges are formed by a series of outer laminations of woven fabric I I impregnated with a suitable binder, such as Bakelite varnish which hardens under heat 10 and pressure, .and the inner laminations I2 may be made of paper impregnated with the same binder. In the embodiment illustrated, the barrel portion I 3, inner portion of the flanges, and the inner portion of the hub, are formed of mac- 15 erated material, such as scraps made in forming the end laminations Il, and the assembly has been consolidated under a pressure of about 1500 pounds per square inch and held at a temperature of from to 175 C. While'it is preferred 20 to use macerated material in the barrel portion of the fbobbin, laminated material may be used, as will be readily understood.

The molding operation is well understood in the art and need not be described in detail. After 25 the assembly has been consolidated to transform the binder into a hard, infusible and substantially insoluble condition, the laminaticns of paper are practically invisible but the woven fabric in the outer lamination may be seen clearly. The ar- 30 rangement offlaminations provides a flange with a tough outer surface which is very resistant to fracture and a smooth inner surface which may be given a high polish and is further polished by 35 use.

As shown in Figs. 2-4, inclusive, the inner portion of the hollow barrel portion of the member 5 is provided with axially disposed ribs I 4 and a connecting end flange I5. In like manner the member 6 is provided with ribs I6 adapted to 40 register with the ribs I4 and has a ange I1 adapted to overlap with the flange I5 and make an interi'itting connecting between the parts. The ribs I4 are drilled and lcountersunk to receive screws I8 and the ribs I6 are drilled and tapped, as indi- 45 cated at I8, to receive the ends of the screws and `enable the two parts to be drawn together snugly.

The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations should be understood-50 therefrom, but the appended claim` should. be construed as broadly as permissible, in view of the prior art.

I claim:

A bobbln comprising two separable parts, each 55 of said parts having an end ange integrally formed with a hollow barrel portion, said barrel portion having axially disposed inner ribs, said iiange having outer laminations of woven fiber and inner laminations of paper, said laminations being disposed at right angles tothe axis of the bobbin and impregnated with a binder which hardens under heat and pressure, said barrel portion being formed of macerated material impreg- 

